Improvement in stacks for puddling, boiling, and other furnaces



llengths-,set one on the other, end to end, cover the bular form,.and of 4any desired length, from boiler-plate illu-imi gisten itt-ett @Wire Letters Patent No. 106,636, dated Qing-ast 23, 1870.

IMPRO'VEMENT 'VIN STACKS FOR PUDDLING, BOILING, AND OTHER FURNACES.

The Schedulereferred to :in these Letters Patent and making part' of the sama To all whom it may concern.-

Be it known that I, WILLIAM SWINDELL, ot' AlleghenyA City, iu the county of Allegheny and State. of Pennsylvania, have invented anew and useful Improvementin I1`nrnace-Stacks; and I do hereby declare the fo lowing to be a full, clear, 'and exact description thereof, reference heilig had to the accom'- panyingr drawing making apart of this specification, in which- Figure 1 is an outside view of a section of 4my improved furnace-stack;

Figure 2 is a vertical section thereof; and

Figure is an enlarged perspect ve vie.vin section, of the paris forming the joint.

Like letters of reference indicate like parts in cach.

In chinmey-stacks tor boiling, puddling, and other furnaces, in which an intense heat is required, it has been found highly advantageous to construct the stack of acasing ot iron, lined o'n the inside with re-brick. Such casings have commonly been made from sheets of boiler-plate iron, riveted together at vthe joints.

In the use ofsuch stacksithas been found that the unequal vertical elongation and shortening ot the brick-work lining and iron casing, eected by'heating and cooling, often causes the sheets to tear apart or give away at the joints in the line of the riveting. In such case, the stacksoon becomes' ruined, and .has to beta-ken down, at least as far as the ruptured joint.

The sheet-s forming the casing cannot be taken apart without spoilingr them for any other use` than reworking, andthe cutting ofthe rivets in taking the stack down is slo'w and 'laborious work.' The stack then vhas to be rebuilt with an'entirely new casing.

By my improvement l make the casing in tubular joint with a sleeve or draw band, which may be riveted or bolted to either length of casing, if so preferred, (but not'to both, unless it be onopposite sides,) and then connect the lengths together by clips, of such constrnctii-m that, while holding the lengths of casing and sleeve or draw-band in place, they shalll permit ofthe elongation and contraction of thes'tack within the required limits, 'withoutdangerof the tearing or giving away of'any part. Them when itbecomes necessary, for any reason, to take down the stack, the clips can be removed, the lengths of casing lifted off successively, and rebuilt into the new stack, so as to lastuntil used up by ordinary wear' and tear.

To enable othelsskilled inlthe art to make and use my improvement; I' will proceed to. describe its constructionfand mode of operation..V

Each length a of the outer 'casing `is made of tuiron or other suitable' material, in any 'of the: ways known to the art- These lengths are of such relative size that they may be built up one on top of another, end to end, into a casing, as shown. l

Over or around the joint formed by each twalength's a `I place a sleeve, l), or a draw-band, bf, as may he preferred, which sleeve or draw-band may be riveted 'or bolted to' either one of the lengths abt-fore or after it is put in place, but not to both, unless it be on (liametrically opposite sides 0f the leasing.

From blanks of the required size I make the clips c, each bent so as to tit on outside of the sleeve l) or draw-bar b', with its ends-resting, one against the. upper, and one against the lover lengthsa, where surh clips are riveted or bolted to the lengths of casing, as` shown, o r they maybe riveted to one length and bolt- .ed to tLe other, the latter beingthepreterable mode;

or the clips may be cast, if so preferred. These clips c are arranged around each joint, at intervals greater orrlesser, as may be preferred or found desirable.V

therefrom; or, if so preferred, one or both the rivet holes in each clip may Abe made in the ihrm of a slot, as shown atc', in which case the clips wiltfoperate withl equal eicacy in bracing the` lengths of casing, and abundant room will be atforded for elongation and contraction, as set forth. v

The mode. of makingcasing described I claim, not only in its application. t-o the uses set fortlnbut' also as applied to the making ofboiler-stacks, or other rolled or plate-iron chimneys, in which use the joint of the. successi-ve lengths may bcvfurther strengthenedit so desired, by a similar sleeve arranged inside, and attached `as above described.

It will now be seen that, not only is the casingin little or no danger of heilig injured from unequal expansion orl contraction, but also that, in case any length should, from defective workn'ianship, pourY material, or otherunibrse'en cause, become .broken or seriously injured, thel stack can be taken down with comparatively little work, till the defective length is removed and replaced'by a new'one, and the old lengt-hs which are still good can be'rebuil't, with the loss'only of the clips and the clip rivets; or, -it' the clipsA are. bolted on` at either end, without any luss'at all; also, should it ecome necessary, from other causes,

Vto rebuild the stack, lthe casing vcan be takelndowu length by length and rebuilt as before.

A further` advantage consists in the fact that, by my improvement, I save a great part of the labor expendedin punching and-riveting the sheets i'orthe ordinary construction of stacks; I also effect a. further reduction in the labor ot'building,` the stack, since, in

. the ordinary mode of building` brieklined stacks, two

sets of hands are required, one to rivet together the successive lengt-hs of casing, and one to build in the brick lining, which operations must be carried on alternately, one set of hands being idle while the other is at work.

By placing one lengt-l1 on the other, covering the joint with a, sleeve or draw-bund, and supportiugit; with clips, as described,`he brieklayers cam carry o n their work with little or nointerruption; and,'t' the clips are bolted on, no skilled labor will be required iu putting up the lengths of casing.

Wht I claim as my invention, and desire to secure by Letters Patent, is-

In furnace-chimneys or stacks, the metalliecusing malle in separate lengths, suoli lengths` beingr joined toget-her'by sleeves or draw-bands :und clips, substantially as set forth.

'In testimony whereof, I, the-said WILLIAM SWIN- DELL, have hereunto set my hand.

WILLIAM SWINDELL.

Witnesses:

WM. F. GRAHAM, G. H. URISTY. 

